Mechanical dobby for weaving looms



Oct. 18, 1960 G. PELLls 2,956,589

MECHANICAL DOBBY FOR WEAVING LOOMS @Wm/m7 ATTO RNEYS Oct. 18, 1960 FiledApril 18, 1956 6 Sheets-Sheet 2 INVENTOR GIOVANNI PELLIS www ATTORNEYSOct. 18, 1960 G. PELLls 2,956,589

MECHANICAL DOBBY FOR wEAvING Looms Filed April 18, 1956 6 Sheets-Sheet 3INVENTOR GlOVA NNI PEL LIS www ATTORNEYS Oct. 18, 1960 G. PELLxs2,956,589

MECHANICAL DOBBY FOR WEAVING LOOMS Filed April 18, 1956 6 Sheets-Sheet 4uw; |IllllIlllllllllllllllllllllll INVENTOR GIOVANNI PELLIS www ATTORNEYS Oct. 18, 1960 G. PELLIS MECHANICAL BOBBY FOR wEAvING Looms 6Sheets-Sheet 5 Filed April 18, 195e INVENTOR GIOVANNI PELLIS BYATTORNEYS G. PELLLIS MECHANICAL DOBBY FOR WEAVING LOOMS Oct. 18, 1960 6Sheets-Sheet 6 Filed April 18, 1956 Giovanni Pellis, 26 Via Pascoli,Goriziagltaly- Filed Apr. 18, 1956, Ser. No. 579,093

Claims priority, application I'tlyriiiie A1,5, ,195s

s claims. (ci. 139-747) Some dobbies for looms at present in use aremounted on the looms in awkward positions, not only in regard to theobstruction caused and the weight, butY also in regard to the diicultyof having 'access'to the different members utilised to connect the loomwith the healds.

The dobby which will hereinafter be describediis provided With improvedoperating means and is more conveniently arranged on the loom withoutany increase" in the space occupied or in the height of the loom.Pulleys, cables, transmission shafts and'other means for connection ofthe dobby to the healds are eliminated, whereby there is obtained abetter eliiciency and elimination of play and friction common to otherknown'constructions.

The improved dobby can be disposed inside' a loomof any type since thefree space beneath the healds is always large and suffices for thispurpose. This' arrangement ensures greater facility for examining anddismantling the different constituent parts of the dobby. The controlofthe clutch and de-clutching means for all the parts serving for thedisplacement of the blades-is entirely mechanical and is ensured bymeans of steel wires mounted in appropriate sheaths joined in the'formof a beam so as to terminate in a control casing orbox larranged at theexterior and carrying the punched cards. lAll the driving means in theframe of the-dobby and in the control casing or box are in a iiow oflubricating oil circulating under pressure by the action of a doubleaction pump arranged at the interior of the frame.'

An embodiment of dobby in accordance with the invention is hereinafterparticularly described with reference to the figures of the accompanyingdrawings, wherein: i

Fig. 1 shows a transverse Section of the dobby.

Fig. 2 shows a longitudinal section of the latter.

Figs. 3 and 4 show details of the operating means for the healds, Fig. 3being a view taken in the'directi'on'Y (Fig. 2) after removal of thecover 31, While Fig. 4 is a similar view but where the lever is inthe-working position. Fig. 5 shows a section of the control casing orbox with the cylinders and drivingmembers forv the' cables whichtransmit the impulses to the clutch 'andde-clutching members of thesinkers. 5 'v H Figs. 6 and 6a together form an assembled view of thedobby and the driving casing or box-mounted' on the loom. f' Fig. 7ashows a vertical central section of the cylinder havingascroll groove7a. Fig. 7b shows a corresponding elevation thereof.

Fig. 8a shows a front elevation, and Fig.v 8b a side elevation of anassembly of oscillating bar and racks.'

Fig. 9a shows an elevation, and Fig. 9b shows a section on the line A--Athereof, of an assembly Aof vtoothed sectors.

Fig. 10 is an elevation of an assembly wherein a rocker arm is coupledto cranks. i

Fig. lla is a side elevation, and Fig. 1lb vis an edge elevation, of aslide.'V

The position of the frame of the dobby is unalterable whereas ,that Q fthe spatial @sins 95 120K Cia the States Patent Patented Oct. 18, 1960 2two entities being connected at a distance by means of flexible cables.i

Referring to Fig. 2, -1 designates a disc cam mounted on one end of acylinder on a shaft 37 connected yto a central drive shaft 36 by a chain34 and "sprii'ckets,` as shown in Fig. 6, with a ratio of 1:1. Adisc'cam .1 is mounted on each end of the cylinder, in the periphery'lof which is hollowed out a cam groove or scroll 7al which, by means of acam follower 3 connected to 'a' toothed sector 2 imparts a rockingmotion to the latterf .The motion includes two stationary periods. Ascan vbe seen from Figures 7a and 7b, cam groove 7a is made so s't'ohave, at each half turn, a straight Vstretch extending over 65.Consequently, along such stretch of 65,o ,thefcin follower is notsubject to any displacement.

The teeth of the sector 2 are engaged with the racks 4, carrying thebars 5, moving with a to and fr'o'mot'io'n in a vertical plane along theguiding means r6. Iii each of the groove elements in the two end facesof thec'ylinder is engaged a cam follower roller 8 carried ,b`y 'a'Ibell crank lever 9. The two levers Q are coupled to the two stop rods10 (see Figures 1 and 2). The motion of the ysaid levers '9 coincidesexactly with the period of 6 5 referred fto above, thatis to say whenall the dobby members are stationary for a certain period of time. Thishappens precisely at each half lturn because the twocams ,7, as shown inFigure 7, have their respectiveI pivoted bers displaced by in relationto each other,4 and consequently the two stop rods 10 move4 alterna eachhalf turn of the cylinder.A Thus, at eachi' of the cylinder cam 1, thereare obtained two Stopp' g'es of movement in opposite'direetions of thetoothed 'se or, during which the bell crank lever 9 executies asimilarto and fro movement causing loweringandraisig'ofthe rods 10 thepurpose of which vis to lock andfnlock ifespectively the pivoted members11 which c` sci1lateik ,n the 12. .l n'. mi) .-ir Sinkers 13 arepivotably mounted in slides 14, as shown in the Figures l() and 11, andcan assmefonlytwfo positions, namely a position of engagement; :th th ar5 (see Figure Al0 and left hand side'of Figure'l), position ofdisengagement from the lbar 5 and4 of engagement with the pivoted member11 see' right'hand Lde of Figure 1). .The slides 14 have notches A ,lengage the rollers Y1.6 carried bythe rocker arm 17; Fig. 1. On the axisof this rocker arm are Vpivtj'itally mounted the connecting rods 18subjected to thef'actionlofthe blades or'cranks 19 at the opposite' endsoflwhich are secured the rods 20 connected `with`the heaids'Zlas shownat Fig. 6. The shaft about which the'cranks I19 rotate consists of twohalves a and b held" together by the rings c. Such a constructionpermits 'an y return of the healds to the zero position as will behereinafter described in greater detail. The control cables 23 disposedin s lheaths (Fig. 5) start from "the control casing or box where they'a're coupled to hooks 24 kept in engagement selectively'with one orotherr of two knives 25 by 'deflectors27 operating in accordance withthe actuation ofthe 'needles/26. The knives 2.5 move simultaneously'inguiding slots 30 and they reciprocate vertically in relation'toeachother in' apredetermine'd manner during the 'workingperiod undertheaction of a cam driven by the"`transmission shaft 37. The feeler`needles 26 are raised and lowered ina predetermined manner by the crank25 atv each rotation of the vdriving shaft 3o and they are maintained intheir upper or high position during the wholeof the time in which thecylinder 22 carrying the punched -cards advances them by onel step.' If,during the'foll descent, the 'feeler needles 26 come op" site ali e inflector 27 which is coupled to the hook 24 engaged with the uppermostknife 25, which thus has to carry it up and pull also the cable 23. Atthe same moment, the rod 10 (Fig. 1) is lowered by reason of the factthat it is actuated, as indicated, by the cranked lever 9, in Such amanner as to unlock the pivoted member 11 which, under the action of thecable 23, will be moved and will push back the hook of the sinker 13beneath the bar 5. The latter, in its ultimate descent, will carry alongthe slide 14 as well as the rocker arm 17 towards the bottom. Throughthe intermediary of the connecting rods 18 and cranks 19, this produceslifting of the healds. In working position, the pivoted member 11ensures the engagement or hooking of the slide 14 onto the bar and inits upward return stroke this latter brings back the slide 14 to itsinitial position. The to and fro movement continues so long as thesinker 13 remains hooked to the bar 5, that is to say so long as thefeeler needle 26 has in front of it a hole in the punched card. When thefeeler needle 26 (see Fig. 5) remains uplifted because there is noperforation in front of it, the deector 27 which is no longer displacedby the punch 29, brings back the hook 24 into engagement with the lowerknife 25 which causes the hook 24 to descend and push back, during thesaid descent, the cable 23 and thereby also the pivoted member 11 (seeFig. l). This member, unlocked at this moment in relation to the bar 10,brings the sinker 13 to its position of rest and the healds remainstationary in their lower positions. When the healds have to remainstationary in their upper position, the two corresponding needles 26will be lowered and produce successively the engagement of the sinkers13 on the right and on the left; the right hand bar 5 4descends andcarries along with it the slide 14 which causes the raising of thehealds. On the other hand, the left hand bar rises and, having arrivedat its upper position, the left hand sinker 13 becomes hooked on. Atthis moment, while the rocker arm 17 rises at the right hand side, itdescends at the left hand side so eifecting an oscillatory movementkeeping its axis stationary, the connecting rods 18 remaining in theirvertical plane; in consequence the healds remain in their upper positionuntil one of the feeler needles 26 remains raised because of the absenceof any perforation in the punched card in front of it, the healds thenagain taking up their to and fro movement starting from the position atwhich they stopped.

There will now be described the adjustment or regulation of the healds.As will be seen in Figs. 1 and 3, the axis of the blades 19 comprisestwo bars a and b, secured by the ring c, and on the external peripheryof which oscillate the blades proper (Fig. 1). The bars a and b arelocked in their turn in the position indicated by the detents d and fwhich are capable of displacement in both directions along the twoguides 35 of the frame. The racks carried by the detents d and f areengaged with the pinion i which itself meshes with the toothed sector lkeyed on the shaft m. The arm n (Figs. 2 and 6) secured on the sameshaft is coupled to a con- Inecting rod carrying a lever capable ofbeing actuated by hand from the exterior of the frame. A safety deviceprevents any risk of effecting adjustment of the healds during operationof the loom.

The detents d and f have at their ends two inclined surfaces o and palong which can move the small rollers q and r. The cranks s and t pivotat u and are connected to the slides v by an arm, the other arm of eachcrank being pivoted at w to a rod (not shown) which connects thesecranks together. Fig. 4 shows the bars a and b in the more widelyseparated position, seen also in Fig. 1. The detents d and f lock thebars a and b when the rollers q and r ride along and up the inclinedsurfaces of the detents of the slides, into the position of maximumseparation. To adjust the healds, the bars a and b are brought togetherin such a manner as to eliminate the pivot about which the blades 19turn.

This result is obtained by withdrawing the detents d and f by rotationof the toothed sector 1 and the pinion wheel by moving the arm in. Thecranks s and t being connected with the detents d and f will then turnabout u so raising the rod w. The latter, in rising, lifts the bladesand the lower healds, the upper healds descending by their own weightuntil at half way they meet the rod w. At this moment, the bars a and bwill be connected on all sides with the common axis in unlocking thering e (see Fig. 1).

To return the healds to the original position, it is necessary toreverse the displacement of the arm n and to return the detents d and fto their working position. The inclined surfaces of the detents engagedbetween the rollers of the bars a and b which are thus moved apart,until they again lock the rings c; at the same time the rod w will belowered and move the blades 19 apart.

I claim:

1. A loom dobby comprising a casing for disposal within the loom framebelow the healds, two parallel horizontal spaced pivot shafts in saidcasing, a plurality of levers journalled on said shafts and arranged inpairs constituted by the adjacent levers on the two shafts, a pluralityof healds, means coupling each pair of levers to a heald, pairs ofspaced vertical guides in the casing positioned below each pair oflevers, slide members in each guide, a plurality of rockers,corresponding in number to the healds, disposed in the casing andcoupled to opposed slide members, means coupling each rocker by itscentre to each lever of a pair, two spaced horizontal parallel drivebars vertically movable in the casing, means for driving said bars inout-of-phase reciprocation, and means for selectively coupling one andthe other and both of the slide members to the associated verticallyreciprocating drive bar, whereby when either of the slide members iscoupled to its drive bar, the associated rocker is moved to lift theassociated heald to a half-raised position, and when both the slidemembers are coupled to their drive bars, the associated rocker is movedto lift the associated heald to a fully raised position.

2. A loom dobby, as claimed in claim l, wherein the means for drivingthe bars in out-of-phase reciprocation comprise a rotatable drive shaftjournalled in the casing, a cylinder secured on said shaft and having ascroll cam groove in its cylindrical surface, a toothed sectorjournalled in the casing, a cam follower on said sector engaged in thecam groove of the cylinder, the groove being so shaped as to reciprocatethe sector angularly, and opposed vertically movable racks meshed withsaid sector and coupled to the drive bars.

3. A loom dobby, as claimed in claim l, wherein means for selectivelycoupling the slide members to the drive bars comprise catch means on theslide members operable to engage with the drive bars, control cableshaving an outer sheath coupled to the casing and to a control box and aninner longitudinally slidable wire coupled to the respective catchelements in the casing and to a control box and an inner longitudinallyslidable wire coupled to the respective catch elements in the casing andto clutch elements in the control box, driven reciprocating slides inthe control box, and punched card and feeler needle means in the controlbox serving to couple the clutch elements to the slides according to thepattern to be woven.

References Cited in the tile of this patent UNITED STATES PATENTS2,674,272 Werner et al. Apr. 6, 1954 FOREIGN PATENTS 1,048,284 FranceDec. 2l, 1953

